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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Supplemental Cash Flow Information [Abstract] |  |  |
Income taxes paid | $ 372.8 | $ 317.8 | $ 371.0
Lease incentives received | $ 8.5 | $ 6.7 | $ 6.4

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- Definition The deferred credit for lease incentives received to be recognized as a reduction of rental expense over the lease term. + References No definition available. + Details
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Namespace Prefix: | payx_
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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